The loads and the distribution of stress amplitude frequency are obtained by cycle count and reliable data for fatigue design are provided by probability density function fit.
用循环计数法求出载荷及应力幅频率分布，用概率密度函数拟合，为疲劳设计提供可靠性高的数据资。
Based on the measured data from the winter wheat fields in Zhengzhou of Henan Province, the vertical distribution of root length density(RLD)and root mass density(RMD)were analyzed.
根据在郑州进行的冬小麦根系田间实测资料，研究了根长密度和根质量密度在砂壤土中的垂直分布。
Experimental results show that this improved scheme can preserve topological relationship very well, but the distribution density of the input data can not be reflected quite well.
实验结果表明，这种改进方案可以很好地保持拓扑关系，但输入数据的分布密度却不能得到较好的体现。
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